Could you please update the installation instructions? It says now that only Python 3.8 and 3.9 are supported.

This was exactly the case for me on iMac Pro 2017 with Radeon Vega 64. With the default_size = 128, one epoch on GPU took 27 s, while on CPU 28 s. With batch_size = 1024, one epoch on GPU took 6 s, while on CPU 21 s.